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  1. #include <iostream>
  2. #include <vector>
  3. #include <string>
  4. #include <sstream>
  5. #include <iomanip>
  6.  
  7. void test1(const std::string &test)
  8. {
  9.     size_t numbytes = test.size() / 2;
  10.  
  11.     std::vector<unsigned char> bytearray;
  12.     bytearray.reserve(numbytes);
  13.  
  14.     for (size_t w = 0, x = 0; w < numbytes; ++w, x += 2) {
  15.         unsigned char b;
  16.  
  17.         char c = test[x];
  18.         if ((c >= '0') && (c <= '9'))
  19.             b = (c - '0');
  20.         else if ((c >= 'A') && (c <= 'F'))
  21.             b = 10 + (c - 'A');
  22.         else if ((c >= 'a') && (c <= 'f'))
  23.             b = 10 + (c - 'a');
  24.         else {
  25.             // error!
  26.             break;
  27.         }
  28.  
  29.         b <<= 4;
  30.  
  31.         c = test[x+1];
  32.         if ((c >= '0') && (c <= '9'))
  33.             b |= (c - '0');
  34.         else if ((c >= 'A') && (c <= 'F'))
  35.             b |= 10 + (c - 'A');
  36.         else if ((c >= 'a') && (c <= 'f'))
  37.             b |= 10 + (c - 'a');
  38.         else {
  39.             // error!
  40.             break;
  41.         }
  42.  
  43.         bytearray.push_back(b);
  44.     }
  45.  
  46.     std::cout << "1: ";
  47.     for(auto b : bytearray)
  48.         std::cout << std::setw(2) << std::setfill('0') << std::hex << (int)b << " ";
  49.     std::cout << std::endl;
  50. }
  51.  
  52. void test2(const std::string &test)
  53. {
  54.     size_t numbytes = test.size() / 2;
  55.  
  56.     std::vector<unsigned char> bytearray;
  57.     bytearray.reserve(numbytes);
  58.  
  59.     for(size_t w = 0, x = 0; w < numbytes; ++w, x += 2)
  60.     {
  61.         std::istringstream iss(test.substr(x, 2));
  62.         unsigned short b;
  63.  
  64.         if (!(iss >> std::hex >> b)) {
  65.             // error!
  66.             break;
  67.         }
  68.  
  69.         bytearray.push_back(static_cast<unsigned char>(b));
  70.     }
  71.  
  72.     std::cout << "2: ";
  73.     for(auto b : bytearray)
  74.         std::cout << std::setw(2) << std::setfill('0') << std::hex << (int)b << " ";
  75.     std::cout << std::endl;
  76. }
  77.  
  78. int main()
  79. {
  80.     std::string test = "48656c6c6f20576f726c64"; 
  81.     std::cout << test << std::endl;
  82.     test1(test);
  83.     test2(test);
  84.     return 0;
  85. }
Success #stdin #stdout 0s 4564KB
comments (?)
stdin 
Standard input is empty
stdout 
48656c6c6f20576f726c64
1: 48 65 6c 6c 6f 20 57 6f 72 6c 64 
2: 48 65 6c 6c 6f 20 57 6f 72 6c 64
https://ideone.com/2FSzOX
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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